Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins

Detalhes bibliográficos
Autor(a) principal: Esteves, Valdemar I.
Data de Publicação: 1995
Outros Autores: Cordeiro, Nereida M. A., Duarte, Armando da Costa
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10400.13/3376
Resumo: The XAD8 and XAD4 resins, used in series, show different behaviours in relation to the retention of dissolved organic matter (DOM) from estuarine water samples according to different salinities. For the XAD8 resin, the removal of DOM measured in terms of light absorbance at 250 nm varies from 69.4% + 0.5 to 51.4% k 3.5 and for the XAD4 resin it varies from 20.0% + 1.0 to 25.2% + 3.0 for salinities ranging from 0.6 to 33.4. The isolation, with XAD8, of DOM from samples increasing in salinity, measured in terms of emission fluorescence intensity at selected wavelengths (410, 440 and 460 nm) for an excitation of 340 nm, decreases. In the same experimental conditions, the increase of fluorescent organic matter (FOM) removed by the addition of XAD4 resin is always greater than 20%. However, addition of NaCl to the sample with the lowest salinity, shows that the retention in both resins is related more to the nature of DOM than to the ionic strength of the sample.
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spelling Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resinsEstuarine watersVariation on the adsorption efficiency of humic substancesXAD resins.Faculdade de Ciências Exatas e da EngenhariaThe XAD8 and XAD4 resins, used in series, show different behaviours in relation to the retention of dissolved organic matter (DOM) from estuarine water samples according to different salinities. For the XAD8 resin, the removal of DOM measured in terms of light absorbance at 250 nm varies from 69.4% + 0.5 to 51.4% k 3.5 and for the XAD4 resin it varies from 20.0% + 1.0 to 25.2% + 3.0 for salinities ranging from 0.6 to 33.4. The isolation, with XAD8, of DOM from samples increasing in salinity, measured in terms of emission fluorescence intensity at selected wavelengths (410, 440 and 460 nm) for an excitation of 340 nm, decreases. In the same experimental conditions, the increase of fluorescent organic matter (FOM) removed by the addition of XAD4 resin is always greater than 20%. However, addition of NaCl to the sample with the lowest salinity, shows that the retention in both resins is related more to the nature of DOM than to the ionic strength of the sample.ElsevierDigitUMaEsteves, Valdemar I.Cordeiro, Nereida M. A.Duarte, Armando da Costa2021-05-06T11:19:18Z19951995-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.13/3376engEsteves, V. I., Cordeiro, N. M., & da Costa Duarte, A. (1995). Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins. Marine chemistry, 51(1), 61-66.10.1016/0304-4203(95)00044-Rinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-03-19T05:34:47Zoai:digituma.uma.pt:10400.13/3376Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T15:06:25.740444Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins
title Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins
spellingShingle Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins
Esteves, Valdemar I.
Estuarine waters
Variation on the adsorption efficiency of humic substances
XAD resins
.
Faculdade de Ciências Exatas e da Engenharia
title_short Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins
title_full Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins
title_fullStr Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins
title_full_unstemmed Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins
title_sort Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins
author Esteves, Valdemar I.
author_facet Esteves, Valdemar I.
Cordeiro, Nereida M. A.
Duarte, Armando da Costa
author_role author
author2 Cordeiro, Nereida M. A.
Duarte, Armando da Costa
author2_role author
author
dc.contributor.none.fl_str_mv DigitUMa
dc.contributor.author.fl_str_mv Esteves, Valdemar I.
Cordeiro, Nereida M. A.
Duarte, Armando da Costa
dc.subject.por.fl_str_mv Estuarine waters
Variation on the adsorption efficiency of humic substances
XAD resins
.
Faculdade de Ciências Exatas e da Engenharia
topic Estuarine waters
Variation on the adsorption efficiency of humic substances
XAD resins
.
Faculdade de Ciências Exatas e da Engenharia
description The XAD8 and XAD4 resins, used in series, show different behaviours in relation to the retention of dissolved organic matter (DOM) from estuarine water samples according to different salinities. For the XAD8 resin, the removal of DOM measured in terms of light absorbance at 250 nm varies from 69.4% + 0.5 to 51.4% k 3.5 and for the XAD4 resin it varies from 20.0% + 1.0 to 25.2% + 3.0 for salinities ranging from 0.6 to 33.4. The isolation, with XAD8, of DOM from samples increasing in salinity, measured in terms of emission fluorescence intensity at selected wavelengths (410, 440 and 460 nm) for an excitation of 340 nm, decreases. In the same experimental conditions, the increase of fluorescent organic matter (FOM) removed by the addition of XAD4 resin is always greater than 20%. However, addition of NaCl to the sample with the lowest salinity, shows that the retention in both resins is related more to the nature of DOM than to the ionic strength of the sample.
publishDate 1995
dc.date.none.fl_str_mv 1995
1995-01-01T00:00:00Z
2021-05-06T11:19:18Z
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status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10400.13/3376
url http://hdl.handle.net/10400.13/3376
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Esteves, V. I., Cordeiro, N. M., & da Costa Duarte, A. (1995). Variation on the adsorption efficiency of humic substances from estuarine waters using XAD resins. Marine chemistry, 51(1), 61-66.
10.1016/0304-4203(95)00044-R
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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